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Thread: hayward heater drip only when on

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    Join Date
    Apr 2010
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    hayward heater drip only when on

    I have a Hayward H400 heater, I think ED1. It's the one with no digital display and a manual thermostat knob (it only has this one knob). I have not used it this season and have had no leaks this season, but when I turned it on today, I heard something that sounds like a drop of water falling on something hot and sizzling. It happens about every 20 seconds or so, but again, when the heater is off I see no signs of leakage anywhere. This is only my second year with a pool and I don't remember hearing this last year. What could it be?

    thanks
    23K gallon, IG, Vinyl, Hayward DE-3600 Filter, Raypak 406A Heater, Hayward 1.5HP SP2610X15 pump aka AO Smith UST1152, TF-100 Test Kit

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    Re: hayward heater drip only when on

    If it only leaks during operation, then it is most likely condensation. There are a few things that can cause excessive condensation:

    1) Heating very cold water.
    2) Excessive flow through heater.
    3) High humidity.
    4) Malfunctioning internal bypass valve.
    5) Malfunctioning thermal control valve.

    Condensation might cause the heat exchanger to soot up, so the heater should be checked for sooting.

  3. Back To Top    #3

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    Re: hayward heater drip only when on

    I only use my pool during the weekend, so on Saturday, so after a few hours of running the heater, if it is condensation, the drip should stop. if it doesn't, what's my next step? Do I remove the right access panel and turn the heater on?

    thanks
    23K gallon, IG, Vinyl, Hayward DE-3600 Filter, Raypak 406A Heater, Hayward 1.5HP SP2610X15 pump aka AO Smith UST1152, TF-100 Test Kit

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    Re: hayward heater drip only when on

    You might need to get a service technician to evaluate the heater.

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    Re: hayward heater drip only when on

    While I hate to say this, I fear the heat exchanger may have a pinhole in it
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: hayward heater drip only when on

    Wouldn't the heat exchanger leak regardless of whether or not the heater is burning?
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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    Re: hayward heater drip only when on

    Quote Originally Posted by X-PertPool
    Wouldn't the heat exchanger leak regardless of whether or not the heater is burning?
    It could be a pinhole, or it could be condensation. If the drip is slow enough, the water could evaporate before becoming noticeable. When the heater is on, the drip is noticeable due to the sound.

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    Re: hayward heater drip only when on

    pressure test the heater then
    -Kevin
    X-Pert Pool Service
    x-pertpool.com
    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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    Re: hayward heater drip only when on

    Use a test strip to see if there's any measurable chlorine in the water that is dripping. If it's the same as you pool water, then it's a leak. If it's chlorine free and your poolwater has chlorine in it, then it's condensation.
    A leak in the heat exchanger will leak at all times that the pump is on because it is under pressure.
    APSP CST Certified
    17k inground concrete; 1.5hp 2 speed Tristar pump, 300sq.ft. Cartridge filter, AquaLogic PS-4 w/ Tcell-15, Navigator suction cleaner.

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